Article ID Journal Published Year Pages File Type
1573416 Materials Science and Engineering: A 2016 11 Pages PDF
Abstract
The hot deformation behavior of alloy 617 has been studied by performing hot compression in a range of temperatures (1173-1473 K) and strain rates (0.001-10 s−1). The peak flow stress found to increase with Zener-Hollomon parameter (Z) following a hyperbolic-sine function relationship whereas peak strain followed power-law type relationship with Z. The average activation energy for the entire hot deformation domain was estimated to be 481 kJ mol−1. The experimental stress-strain data has been used to develop processing map employing dynamic material model. The material exhibits a wide stable domain below 0.1 s−1 spanning over 1250-1473 K, with a peak efficiency of ~45%. Based on the processing map and subsequent microstructural observation, the optimum hot deformation domain of alloy 617 is identified as 1323-1423 K and 0.001-0.1 s−1. Furthermore, microstructural observation alone has revealed that a significant DRX with grain refinement could also be obtained at high temperature (>1373 K) and high strain rate (>1 s−1) domain although processing map has marked this region as unstable domain.
Related Topics
Physical Sciences and Engineering Materials Science Materials Science (General)
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